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-rw-r--r--target/linux/cns3xxx/patches-4.19/010-arm_introduce-dma-fiq-irq-broadcast.patch80
1 files changed, 80 insertions, 0 deletions
diff --git a/target/linux/cns3xxx/patches-4.19/010-arm_introduce-dma-fiq-irq-broadcast.patch b/target/linux/cns3xxx/patches-4.19/010-arm_introduce-dma-fiq-irq-broadcast.patch
new file mode 100644
index 0000000000..45f8feead4
--- /dev/null
+++ b/target/linux/cns3xxx/patches-4.19/010-arm_introduce-dma-fiq-irq-broadcast.patch
@@ -0,0 +1,80 @@
+--- a/arch/arm/include/asm/glue-cache.h
++++ b/arch/arm/include/asm/glue-cache.h
+@@ -156,9 +156,15 @@ static inline void nop_dma_unmap_area(co
+ #define __cpuc_flush_user_range __glue(_CACHE,_flush_user_cache_range)
+ #define __cpuc_coherent_kern_range __glue(_CACHE,_coherent_kern_range)
+ #define __cpuc_coherent_user_range __glue(_CACHE,_coherent_user_range)
+-#define __cpuc_flush_dcache_area __glue(_CACHE,_flush_kern_dcache_area)
+
+-#define dmac_flush_range __glue(_CACHE,_dma_flush_range)
++#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
++# define __cpuc_flush_dcache_area __glue(_CACHE,_flush_kern_dcache_area)
++# define dmac_flush_range __glue(_CACHE,_dma_flush_range)
++#else
++# define __cpuc_flush_dcache_area __glue(fiq,_flush_kern_dcache_area)
++# define dmac_flush_range __glue(fiq,_dma_flush_range)
++#endif
++
+ #endif
+
+ #endif
+--- a/arch/arm/mm/Kconfig
++++ b/arch/arm/mm/Kconfig
+@@ -916,6 +916,17 @@ config DMA_CACHE_RWFO
+ in hardware, other workarounds are needed (e.g. cache
+ maintenance broadcasting in software via FIQ).
+
++config DMA_CACHE_FIQ_BROADCAST
++ bool "Enable fiq broadcast DMA cache maintenance"
++ depends on CPU_V6K && SMP
++ select FIQ
++ help
++ The Snoop Control Unit on ARM11MPCore does not detect the
++ cache maintenance operations and the dma_{map,unmap}_area()
++ functions may leave stale cache entries on other CPUs. By
++ enabling this option, fiq broadcast in the ARMv6
++ DMA cache maintenance functions is performed.
++
+ config OUTER_CACHE
+ bool
+
+--- a/arch/arm/mm/flush.c
++++ b/arch/arm/mm/flush.c
+@@ -319,6 +319,7 @@ void __sync_icache_dcache(pte_t pteval)
+ void flush_dcache_page(struct page *page)
+ {
+ struct address_space *mapping;
++ bool skip_broadcast = true;
+
+ /*
+ * The zero page is never written to, so never has any dirty
+@@ -335,7 +336,10 @@ void flush_dcache_page(struct page *page
+
+ mapping = page_mapping_file(page);
+
+- if (!cache_ops_need_broadcast() &&
++#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
++ skip_broadcast = !cache_ops_need_broadcast();
++#endif
++ if (skip_broadcast &&
+ mapping && !page_mapcount(page))
+ clear_bit(PG_dcache_clean, &page->flags);
+ else {
+--- a/arch/arm/mm/dma.h
++++ b/arch/arm/mm/dma.h
+@@ -5,8 +5,13 @@
+ #include <asm/glue-cache.h>
+
+ #ifndef MULTI_CACHE
+-#define dmac_map_area __glue(_CACHE,_dma_map_area)
+-#define dmac_unmap_area __glue(_CACHE,_dma_unmap_area)
++#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
++# define dmac_map_area __glue(_CACHE,_dma_map_area)
++# define dmac_unmap_area __glue(_CACHE,_dma_unmap_area)
++#else
++# define dmac_map_area __glue(fiq,_dma_map_area)
++# define dmac_unmap_area __glue(fiq,_dma_unmap_area)
++#endif
+
+ /*
+ * These are private to the dma-mapping API. Do not use directly.